Question

the class marks of a frequncy distribution are 6,10,14,18,22,26,30.Find its class size

Answer 1

We observe that 10 - 6 = 4, 14 - 10 = 4 .....& so one.

Hence, class size is 4.

Now, the difference between the values of two consecutive class marks is 4, therefore we subract 4/2 = 2 from each class mark to get the lower limit of the corresponding class interval and add 5 to each class mark to get the upper limit.

Thus, the class intervals are
4 - 8
8 - 12
12 - 16
16 - 20
20 - 24
24 - 28
28 - 32